Malicious PDF — malware analysis report

Static analysis result for SHA-256 728be0feba56a5d6…

MALICIOUS

PDF

62.2 KB Created: 2020-11-14 09:08:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2210a7aa7612a44760274025e2af27c4 SHA-1: 183901c23b3f06eca41c2d5d57bec2e3e3b41087 SHA-256: 728be0feba56a5d68c613f009afb9b566af9af7a660533be3a42c4de035a4307
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF structure suggest an attempt to lure users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/strik?utm_term=ib+language+b+guide+first+examinatio In PDF document text
    • https://mepuralomelefaz.weebly.com/uploads/1/3/4/4/134494325/7609333.pdfIn PDF document text
    • https://sefuxogam.weebly.com/uploads/1/3/4/4/134466031/6965b7fcbce41cd.pdfIn PDF document text
    • https://wedebiki.weebly.com/uploads/1/3/0/9/130969436/9324627.pdfIn PDF document text
    • https://rulomegujenuguv.weebly.com/uploads/1/3/4/3/134329868/f931cfb3701abc.pdfIn PDF document text
    • https://wekijoborumotis.weebly.com/uploads/1/3/4/4/134484899/9469643.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/389db29d-4aec-40d3-9557-dcf831420aca/netifagazegapiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e98dc91f-f570-48c3-a240-0d52f35c9bcc/lenuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e02702d-ed2b-4ca7-b9b5-8e1f530ea513/fonarerasosixolevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/032fbdab-98ff-44f2-af10-fbd2431d0938/gabinaxuwosozalewizul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8407439b-9dd1-4833-a6e7-140b46ee979b/discovering_computers_2017_shelly_cashman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6147fc92-9036-454b-97dd-d270a455003c/bufigituserojowesadobebuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3121080c-582f-40b2-8a25-3b860546e5e1/hard_sell_advertising.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/free_printable_punctuation_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/59219598588.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b42fa8f-9bc6-477e-a15d-28ecdf223afb/26315831682.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB806 5372 bytes
SHA-256: 2d70c6a69a4bc26c8775bd4a7c7deb882383481300cdd47298ec738c12a02153
font_01_sfnt_off0000ca40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA40 9880 bytes
SHA-256: 9be3a396e57295ff233ebcf56da4d792f5060656861a3e23e62f289c75d70f10

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